Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this. Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires. Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via
    deeply nested field names in multipart form data. The append-field dependency parses bracket notation in
    field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested
    object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is
    sufficient to exploit this. Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x
    prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application
    requires. Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker
    can send per request. This does not fully mitigate the issue but limits the impact. (CVE-2026-5079)

ID	Name	Product	Family	Type	Severity
464352	Echo: multer: security update to 2.2.0	Tenable Cloud Security	Echo Local Security Checks	Local	high
464352	Echo: multer: security update to 2.2.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
443368	SCA: security update for multer (GHSA-72gw-mp4g-v24j)	Tenable Cloud Security	SCA Checks	Local	high
443368	SCA: security update for multer (GHSA-72gw-mp4g-v24j)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-5079

high

Tenable Plugins

high

high

high

high